Someone else said they had this problem recently and it was caused by some sort of issue with the itch.io servers that they were trying to download from >.<
For them, I uploaded the file to Google Drive instead and they were able to download it from there successfully :3
I don’t know if it will help you, but if you want to try it, this is a link for the direct download from Google Drive:
https://drive.google.com/file/d/1u0WSypwd8tkZww7rVcAZwCAnQE86SxFV/view?usp=shari...
(this is for the windows version - if you need the mac one instead, just lemme know :3)
I hope it helps! Thanks for your interest in the game :3